Retrospec Jax, User Manual

User’s Manual Electric Bike

From the initial 12 o’clock position (battery and carrier are unlocked), insert the key 

into the key slot, press and turn it clockwise to 6 o’clock position (battery now locked 

into the housing). Reverse steps to unlock.

Battery Charging

You can charge your battery while installed on the bike or 

removed for remote charging. If your bike is near an AC outlet, 

you can charge it with your bike’s battery still installed. The 

charging port is covered by a plastic cap (Fig 4.3). 

Alternatively, you can remove the battery for charging. This 

feature is useful in small areas where the bike will not fit or AC 

power supply is not near the bike. Following the steps above, 

make sure the battery is unlocked before removal. Make sure 

the switch is off and remember to keep your key secure!

       WARNING! Use only the charger provided with the electric bike, otherwise damage 

could occur to your battery and void the warranty. When charging, both battery and 

charger should be minimum 4 in (10cm) away from the wall, and in a cool, ventilated 

environment. Place nothing around the charger while in use!

4. LCD and Function

Our KD58C Display Panel provides control of functions to fit the users needs. 

The Display Panel indicates the following:

• 

Smart Battery

• 

Power Assistance-Level

• 

Speed indication (current speed, max speed, and average speed) 

• 

Motor-Output

• 

Trip Time

• 

Trip Distance and Total Distance

• 

Push-Assistance Function 

• 

Error Code Indicator

Button Definition 

The KD58C Display Panel has 3 buttons (M, +, -) which represent the functions

M/MODE, +/UP, & -/DOWN.

2. Operation

Your new electric assistance bicycle is a revolutionary means of transport, using 

an aluminum frame, Li-Ion battery, a super high efficiency electric hub motor, and 

controller with electric pedal assistance system, to support normal pedaling. These 

components will ensure safe riding with excellent function and performance. It is 

important for you to note the following guidelines to ensure getting the best possible 

experience from your electric bicycle.

2.1 Always check your bicycle before riding.

2.1.1 Before riding, check that the tires are fully inflated as indicated on the tire 

sidewall.

Remember, performance of the bike and battery range is directly related to the weight 

of the rider and baggage/load, together with the stored energy in the battery. Battery 

range/performance can vary significantly based on terrain, load, & weather conditions.

2.1.2 Charge overnight, prior to riding the next day.

2.1.3 Clean and apply chain lube periodically as needed. With a soft rag or towel, wipe 

off excess lube. Clean and lubricate half-yearly (minimum).

3. Battery Installation & Usage.

Retrospec Jax Rev 500W & 750W have the battery positioned on the rear of the 

frame seat tube (Fig 2). 

The battery box bottom is fixed on bottom of the frame seat tube by screws (Fig 2.1). 

Then the battery case is locked by the key - see the operation details below.

11

12

Fig 2.

Fig 2.1

Fig 3.

1. Insert and slide the Battery Pack vertically into the Battery/Controller Housing with 

the indicator facing up (Fig. 3), then slowly and firmly push it into place for a snug fit. 

2. Make sure the Battery Pack is firmly pushed into the Battery/Controller Housing and 

the connector is securely inserted inside the controller box.

Fig 4.2

Fig 4.3

NOTE: Battery Lock (Fig 4.2)